Self-Formaldehyde-scavenging heat-resistant ABS material and preparation method therefor

Abstract

Disclosed are a self-formaldehyde-scavenging heat-resistant ABS material and a preparation method therefor. The material includes following components in parts by weight: 75-95 parts of an ABS resin, 4-20 parts of a heat-resistant agent, 0.5-5 parts of a formaldehyde-scavenging masterbatch, 0.1-1 part of a formaldehyde-scavenging agent and 0.5-1 part of other auxiliaries. During preparation, the ABS resin, the heat-resistant agent and the other auxiliaries are mixed and fed through a main feeding port of a twin-screw extruder; and the formaldehyde-scavenging masterbatch and the formaldehyde-scavenging agent are fed to a rear section of the extruder, extruded and pelletized. By the method of the present invention, the content of formaldehyde in particles can be reduced by 40%, and the content of formaldehyde in a closed space can be reduced by 50% or more. Moreover, the content of other volatile organic compounds is reduced by 10% to 20%. Thus, the effects of controlling the formaldehyde emission from a material for a long time and inhibiting the content of formaldehyde in a space are achieved.

1 . A self-formaldehyde-scavenging heat-resistant ABS (Acrylonitrile-butadiene-styrene) material composition, comprising following components in parts by weight: 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   acrylonitrile-butadiene-styrene resin 
                   75-95 parts, 
                 
                     
                   heat-resistant agent 
                    4-20 parts, 
                 
                     
                   formaldehyde-scavenging masterbatch 
                    0.5-5 parts, 
                 
                     
                   formaldehyde-scavenging agent 
                    0.1-1 part, and 
                 
                     
                   auxiliary B 
                    0.5-1 part, 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
               
            
           
         
         wherein the formaldehyde-scavenging masterbatch comprises a physical adsorbent, and a formaldehyde capture agent. 
       
     
     
         2 . The self-formaldehyde-scavenging heat-resistant ABS material composition according to  claim 1 , wherein the formaldehyde-scavenging masterbatch comprises following components in parts by weight: 
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   the physical adsorbent 
                   75-95 parts, 
                 
                     
                   the formaldehyde capture agent 
                    5-25 parts, and 
                 
                     
                   auxiliary A 
                    0.5-1 part. 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
               
            
           
         
       
     
     
         3 . The self-formaldehyde-scavenging heat-resistant ABS material composition according to  claim 2 , wherein the physical adsorbent is one or two of diatomaceous earth and porous montmorillonite. 
     
     
         4 . The self-formaldehyde-scavenging heat-resistant ABS material composition according to  claim 2 , wherein the formaldehyde capture agent is one or more members selected from a group consisting of melamine, 2-imidazolidinone, and carbohydrazide. 
     
     
         5 . The self-formaldehyde-scavenging heat-resistant ABS material composition according to  claim 2 , wherein both the auxiliary A and the auxiliary B are one or more members selected from a group consisting of a hindered phenol antioxidant, a phosphite antioxidant, and a lubricant. 
     
     
         6 . The self-formaldehyde-scavenging heat-resistant ABS material composition according to  claim 1 , wherein the formaldehyde-scavenging agent is one or more members selected from a group consisting of nano silver, titanium dioxide, zinc oxide, and tin oxide. 
     
     
         7 . The self-formaldehyde-scavenging heat-resistant ABS material composition according to  claim 6 , wherein the nano silver has a particle size of 20-70 nm. 
     
     
         8 . The self-formaldehyde-scavenging heat-resistant ABS material composition according to  claim 1 , wherein the heat-resistant agent is N-phenylmaleimide-styrene-maleic anhydride copolymer or α-methylstyrene-acrylonitrile copolymer. 
     
     
         9 . A method for preparing a self-formaldehyde-scavenging heat-resistant ABS (Acrylonitrile-butadiene-styrene) material composition, wherein:
 the composition comprises following components in parts by weight:   
       
         
           
                 
                 
                 
               
                     
                     
                 
                     
                   acrylonitrile-butadiene-styrene resin 
                   75-95 parts, 
                 
                     
                   heat-resistant agent 
                    4-20 parts, 
                 
                     
                   formaldehyde-scavenging masterbatch 
                    0.5-5 parts, 
                 
                     
                   formaldehyde-scavenging agent 
                    0.1-1 part, and 
                 
                     
                   auxiliary B 
                    0.5-1 part, 
                 
                     
                     
                 
             
                
               
               
                
                
                
                
                
                
               
            
           
         
         the formaldehyde-scavenging masterbatch comprises a physical adsorbent, and a formaldehyde capture agent; 
         the method comprises steps of: 
         (S1) mixing the physical adsorbent, the formaldehyde capture agent, and the auxiliary A, and obtaining a mixed material A; 
         (S2) feeding the mixed material A to an internal mixer, shear-blending, granulating, and obtaining the formaldehyde-scavenging masterbatch; 
         (S3) mixing the acrylonitrile-butadiene-styrene resin, the heat-resistant agent, and the auxiliary B, and obtaining a mixed material B; and 
         (S4) feeding the mixed material B to a twin-screw extruder having a barrel temperature of 180-260° C. and a screw rotational speed of 200-600 rpm, adding the formaldehyde-scavenging agent and the formaldehyde-scavenging masterbatch to a rear section of the twin-screw extruder by side feeding, pelletizing, and obtaining the self-formaldehyde-scavenging heat-resistant ABS material composition. 
       
     
     
         10 . The method for preparing the self-formaldehyde-scavenging heat-resistant ABS material composition according to  claim 9 , wherein in the step (S2), a temperature in the internal mixer is 150-260° C., a rotational speed is 10-60 rpm, and a blending time is 0.5-10 min.